Since the mGBA Emulator PS4 port and Yabause Sega Saturn Emulator PS4 port, PlayStation 4 homebrew developer @zezu420 (aka Znullptr on Twitter) worked on a PCSXR (CodePlex Archive) PS4 port of the PlayStation emulator PCSX-Reloaded based on the PCSX-df Project. 🕹️
According to his Patreon page...